Default controller not working

One of my codeigniter application(version2.2) was working fine in the XAMPP(php version 5.5).
Now i updated my XAMMP with php version 5.6- this case my controller stops the functioning.

below is my configuration in autoload.php
now  $autoload["libraries"]=array('database','session')

if i remove database in the above array, controller start functioning properly. But without database i cant do anything in the application

Please help me.

Do you have an error message or anything? We'll need more info to help you debug.

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Do you have an error message or anything? We'll need more info to help you debug.

Hi

 There is no error information to display. exection is not coming into the controller.same application works fine in php 5.5 environment.